From bays with sandy, rolling dunes to hidden pebbly coves, James Ellis discovers the top secluded spots to swim

Northern Spain1 Playa de Gulpiyuri Llanes
Asturias
Gulpiyuri is surely a one-off: a beach fed by seawater that is not on the
coast. In the middle of a meadow backed by cliffs, and set 100m back from
the shoreline lies this narrow strip of sand that is fed by waves from the
Bay of Biscay coursing through tunnels in the limestone. When it comes back
to the surface, it’s a little cold, thanks to it being underground for so
long, but the surreal nature outweighs any chill factor.Stay El Molino de Tresgrandas is a charming rural hotel at